JP3700991B2

JP3700991B2 - Method for mounting fuel injection device on engine and fuel injection device

Info

Publication number: JP3700991B2
Application number: JP09326697A
Authority: JP
Inventors: 潔畑浦; 紀滝井; 博三雲
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 1996-05-02
Filing date: 1997-04-11
Publication date: 2005-09-28
Anticipated expiration: 2017-04-11
Also published as: JPH1030515A

Description

【０００１】
【発明の属する技術分野】
本発明は、燃料噴射装置をエンジンに装着する方法と燃料噴射装置に関する。
【０００２】
【従来の技術】
本発明の発明者らは、本発明に先立ち、図４に示すエンジン装着用の燃料噴射装置を製作した。この燃料噴射装置１２３は、次のように構成してある。
この燃料噴射装置１２３は、ポンプケース１０１と、ポンプケース１０１に固定した燃料噴射ポンプ１０２と、ポンプケース１０１内に架設した燃料噴射カム軸１０３と、ポンプケース１０１のケース端壁１０４に設けた接続部１０５と、この接続部１０５から突出させた燃料噴射カム軸１０３の入力端部１０６とを備えている。
【０００３】
そして、エンジンの調時伝動ギヤケース１０８にポンプケース１０１をその接続部１０５で接続できるようにし、燃料噴射カム軸１０３の入力端部１０６に燃料噴射カムギヤ１０７を所定の姿勢で固定できるようにし、調時伝動ギヤケース１０８に接続したポンプケース１０１を、燃料噴射カム軸１０３を中心として回転できるようにし、回転を停止させた姿勢のポンプケース１０１を調時伝動ギヤケース１０８に固定できるようにしている。
【０００４】
本発明の発明者らは、上記装置１２３を次のようにしてエンジンに装着した。
エンジンの調時伝動ギヤケース１０８にポンプケース１０１をその接続部１０５で接続する作業と、燃料噴射カム軸１０３の入力端部１０６に燃料噴射カムギヤ１０７を所定の姿勢で固定する作業と、クランクギヤ１１５の連動ギヤ１１６に燃料噴射カムギヤ１０７を所定の姿勢で噛み合わせる作業とを行った。クランクギヤ１１５から燃料噴射カムギヤ１０７までの調時伝動ギヤ列１４３の各ギヤ同士の噛み合わせは各ギヤに設けたマーク１１４同士を符合させて行った。
【０００５】
上記装置１２３には、本発明の装置のように、燃料噴射カム軸１０３の回転を仮止めする手段はなく、この装置１２３をエンジンに装着する場合には、エンジンの調時伝動ギヤケース１０８にポンプケース１０１を接続した後、燃料の噴射開始時期を設定する作業を行う必要がある。
【０００６】
燃料の噴射開始時期を設定する作業は次のようにして行った。
まず、ポンプケース１０１を任意の姿勢で調時伝動ギヤケース１０８に仮止めした。次に、クランク軸１１７を手動でゆっくりと回転させながら、燃料噴射ポンプ１０２の燃料吐出口（図外）の燃料油面を目視で観察した。そして、燃料油面が盛り上がり始めたら、これを燃料噴射の開始とみなし、その時点でクランク軸１１７の回転を停止させた。次に、フライホイルカバー１４５の指針１４６と符合したフライホイル１３６の目盛り１４４により、クランク角度を読み取り、噴射開始時期を測定した。次に、測定した噴射開始時期を目標値に近づけるため、ポンプケース１０１の仮止めを解除し、ポンプケース１０１を回転させた。この回転により、燃料噴射カム軸１０３に対する燃料噴射ポンプ１０２の姿勢を修正し、再度、ポンプケース１０１を仮止めした。以降、噴射開始時期が目標値になるまで、噴射開始時期の測定と、燃料噴射ポンプ１０２の姿勢の修正を繰り返した。
【０００７】
【発明が解決しようとする課題】
上記技術には、次の問題がある。
上記技術では、燃料噴射ポンプ１０２の燃料吐出口の燃料油面が盛り上がり始めるのを目視で観察し、これに基づいて燃料の噴射開始時期を測定する。しかし、このような観察方法では、正確さを欠き、噴射開始時期の測定精度が低くなる。また、調時伝動ギヤ列１４３の遊びも噴射開始時期の測定精度を低下させる要因になる。このように、上記技術では、噴射開始時期の測定精度が低いため、噴射開始時期を正確に設定できない。
【０００８】
また、上記技術では、エンジンの調時伝動ギヤケース１０８にポンプケース１０１を接続した後、噴射開始時期を設定する作業を行う。この作業では、噴射開始時期の測定と、燃料噴射ポンプ１０２の姿勢の修正とを繰り返すため、その作業時間は比較的長くなる。そして、この作業により燃料噴射ポンプ１０２の姿勢が決まった後、この燃料噴射ポンプ１０２に燃料噴射管（図外）を接続する作業が行われる。このように、上記技術では、エンジンの組み立て作業の一部であるポンプケース１０１の接続作業と燃料噴射管の接続作業との間に、エンジンの組み立て作業に無関係な噴射開始時期の設定作業が割り込み、比較的長い時間、エンジンの組み立て作業を中断させるため、エンジンの組み立て作業が停滞する。
【０００９】
各発明が解決しようとする課題は次の通りである。
第１発明から第３発明は、いずれも、エンジンに燃料噴射装置を装着する方法に関するものである。第１発明は、燃料の噴射開始時期を正確に設定できるとともに、エンジンの組み立て作業が停滞しないものを提供することを課題とする。第２発明は、第１発明の課題に加え、燃料噴射時期をより正確に設定できるとともに、燃料噴射カム軸の仮止め手段である一対のオネジ杆を有効利用できるものを提供することを課題とする。第３発明は、第２発明の課題に加え、燃料噴射カム軸の姿勢を予備調節する作業を迅速かつ正確に行えるものを提供することを課題とする。
【００１０】
第４発明と第５発明は、いずれもエンジン装着用のエンジンに関するものである。第４発明は、第１発明から第３発明の方法に有効に用いることができるものを提供することを課題とする。第５発明は、第４発明の課題に加え、一対のオネジ杆の螺動操作を容易に行えるものを提供することを課題とする。
【００１１】
【課題を解決するための手段】
第１発明から第５発明の主要な構成は次の通りである。
（第１発明）
第１発明は、燃料噴射装置をエンジンに装着する方法に関するものである。
第１発明は、ポンプケース１と、燃料噴射ポンプ２と、燃料噴射カム軸３と、接続部５と、燃料噴射カム軸３の入力端部６と、一対のオネジ杆３７ａ・３７ｂとを備えたエンジン装着用の燃料噴射装置２３を用い、次の作業を行うことを特徴とする。
【００１２】
燃料噴射カム軸３の回転を仮止めする作業と、クランク軸１７の回転を仮止めする作業とを行う。燃料噴射カム軸３の回転を仮止めする作業では、一対のオネジ杆３７ａ・３７ｂで燃料噴射カム軸３の正逆回転３ａ・３ｂを受け止める。
【００１３】
次に、エンジンの調時伝動ギヤケース８にポンプケース１を接続する作業と、調時伝動ギヤ列４３の噛み合わせ作業とを行う。次に、ポンプケース１を回転させ、調時伝動ギヤ列４３の遊びをなくした後、ポンプケース１を調時伝動ギヤケース８に固定する。
次に、燃料噴射カム軸３の回転の仮止めと、クランク軸１７の回転の仮止めとを解除する。
これにより、上記調時伝動ギヤ列４３の遊びをなくす際、燃料噴射カム軸３にかかる正回転３ａと同じ向きの反力が、正回転３ａを受け止めるオネジ杆３７ａで受け止められ、燃料噴射カム軸３の仮止め姿勢をずらすことなく、噴射開始時期の設定が行われるようにした。
【００１４】
尚、燃料噴射カム軸３とクランク軸１７の仮止めの姿勢は次のようにして決める。燃料噴射装置２３を組み付けるエンジンの機種と噴射開始時期の目標値が定まると、クランク軸１７と燃料噴射カム軸３と燃料噴射ポンプ２との相対的な姿勢は、実測により又は計算により定まる。このため、燃料噴射装置２３をエンジンに装着した時に、上記相対的な姿勢が再現されるように、燃料噴射カム軸３とクランク軸１７との仮止めの姿勢を決める。また、燃料噴射カム軸３の正回転３ａとは、エンジン運転中に、クランク軸１７から燃料噴射カム軸３が連動される向きの回転をいい、逆回転３ｂとは、正回転３ａと逆向きの回転をいう。
【００１５】
（第２発明）
第２発明は、燃料噴射装置をエンジンに装着する方法に関するものである。
第２発明は、第１発明において、燃料噴射カム軸３の回転を仮止めする作業を行うに際し、燃料噴射カム軸３の姿勢を予備調節する作業を行った後、燃料カム軸３の姿勢を微調節する作業を行い、この微調節の作業に一対のオネジ杆３７ａ・３７ｂを利用することを特徴とする。
【００１６】
（第３発明）
第３発明は、燃料噴射装置をエンジンに装着する方法に関するものである。
第３発明は、第２発明において、燃料噴射カム軸３の姿勢を予備調節する作業を行うに際し、燃料噴射カム軸３をステップモータ４１で回転させることを特徴とする。
【００１７】
第４発明は、エンジン装着用の燃料噴射装置に関するものである。
第４発明は、ポンプケース１、ポンプケース１に固定した燃料噴射ポンプ２と、ポンプケース１内に架設した燃料噴射カム軸３と、ポンプケース１のケース端壁４に設けた接続部５と、この接続部５から突出させた燃料噴射カム軸３の入力端部６と、ポンプケース１のケース壁１１に螺動自在に貫通させた一対のオネジ杆３７ａ・３７ｂとを備えた、エンジン装着用の燃料噴射装置であって、
一対のオネジ杆３７ａ・３７ｂの先端を燃料噴射カム軸３に接当させ、燃料噴射カム軸３の正回転３ａを一方のオネジ杆３７ａで、逆回転３ｂを他方のオネジ杆３７ｂでそれぞれ受け止めることにより、燃料噴射カム軸３を所定の姿勢でポンプケース１に仮止めできるようにし、
エンジンの調時伝動ギヤケース８にポンプケース１をその接続部５で接続できるようにし、燃料噴射カム軸３の入力端部６に燃料噴射カムギヤ７を所定の姿勢で固定できるようにし、調時伝動ギヤケース８に接続したポンプケース１を、燃料噴射カム軸３を中心として回転できるようにし、回転を停止させた姿勢のポンプケース１を調時伝動ギヤケース８に固定できるようにすることにより、
燃料噴射カム軸３にその正回転３ａと同じ向きの反力がかかると、その反力が正回転３ａを受け止めるオネジ杆３７ａで受け止められ、燃料噴射カム軸３の仮止め姿勢がずれることがないようにした。
【００１８】
第５発明は、エンジン装着用の燃料噴射装置に関するものである。
第５発明は、第４発明において、ポンプケース１の横一側のケース壁１１に一対のオネジ杆３７ａ・３７ｂを貫通させたことを特徴とする。
【００１９】
【作用】
第１発明の作用は次の通りである。
第１発明では、ポンプケース１を調時伝動ギヤケース８に接続する前に、ポンプケース１に燃料噴射カム軸３を仮止めするので、ポンプケース１を治具等に固定した状態で、燃料噴射カム軸３の仮止め作業を行うことができ、その仮止めの姿勢を正確に設定できる。
【００２０】
また、燃料噴射カム軸３の正逆回転３ａ・３ｂを一対のオネジ杆３７ａ・３７ｂでそれぞれ受け止めるので、燃料噴射カム軸３の仮止めの姿勢を確実に維持できる。また、クランク軸１７の姿勢は、ピストンの位置の測定等により、正確に特定することができるので、クランク軸１７の仮止め姿勢も正確に設定できる。
【００２１】
また、ポンプケース１を燃料噴射カム軸３の逆回転３ｂと同じ方向１９に回転させるだけで、調時伝動ギヤ列４３の遊びをなくすことができる。その際、燃料噴射カム軸３にその正回転３ａと同じ向きの反力がかかるが、この反力は正回転３ａを受け止めるオネジ杆３７ａで受け止められるので、燃料噴射カム軸３の仮止めの姿勢がずれることはない。
【００２２】
第１発明では、燃料噴射カム軸３とクランク軸１７とを所定の姿勢で仮止めした後、調時伝動ギヤケース８にポンプケース１を接続し、調時伝動ギヤ列４３の噛み合わせを行い、ポンプケース１を回転させるだけで、噴射開始時期の設定が行われる。このうち、燃料噴射カム軸３を仮止めする作業は、ポンプケース１を調時伝動ギヤケース８に接続する前に行われるため、エンジンの組み立て作業から分離して行うことができる。また、残りの作業は、エンジンの組み立て作業中、比較的短時間で行うことができる。
【００２３】
【発明の効果】
（第１発明）
第１発明は次の効果を奏する。
第１発明では、燃料噴射カム軸３の仮止めの姿勢を正確に設定でき、その姿勢を確実に維持できる。また、クランク軸１７の仮止めの姿勢も正確に設定できる。また、調時伝動ギヤ列４３の遊びをなくすことができ、その際、燃料噴射カム軸３の仮止め姿勢がずれることはない。これらの理由により、第１発明では、燃料噴射時期を正確に設定できる。
【００２４】
第１発明では、噴射開始時期を設定する作業のうち、燃料噴射カム軸３を仮止めする作業は、エンジンの組み立て作業から分離して行うことができ、残りの作業は、エンジンの組み立て作業中、比較的短時間で行うことができる。このため、エンジンの組み立て作業が停滞しない。
【００２５】
（第２発明）
第２発明は、第１発明の効果に加え、次の効果を奏する。
第２発明では、燃料噴射カム軸３の姿勢を予備調節した後、その姿勢を微調節するので、燃料噴射カム軸３の仮止めの姿勢を正確に設定できる。このため、燃料噴射時期をより正確に設定できる。
【００２６】
第２発明では、一対のオネジ杆３７ａ・３７ｂの螺動操作により、燃料噴射カム軸３の姿勢の微調節を行う。このため、燃料噴射カム軸３の仮止め手段である一対のオネジ杆３７ａ・３７ｂを、燃料噴射カム軸３の姿勢の微調節手段としても有効に利用できる。
【００２７】
（第３発明）
第３発明は、第２発明の効果に加え、次の効果を奏する。
第３発明では、燃料噴射カム軸３の姿勢を予備調節する作業を行うに際し、燃料噴射カム軸３をステップモータ４１で回転させる。このため、予備調節の作業を迅速かつ正確に行うことができる。
【００２８】
第３発明では、燃料噴射カム軸３の姿勢をステップモータ４１で予備調節した後、その姿勢を一対のオネジ杆３７ａ・３７ｂにより微調節する。このため、ステップモータ４１に位置決め精度の高いものを用いる必要がない。
【００２９】
（第４発明）
第４発明は、次の効果を奏する。
第４発明の装置は、第１発明から第３発明の方法に有効に用いることができる。
【００３０】
（第５発明）
第５発明は、第４発明の効果に加え、次の効果を奏する。
第４発明では、ポンプケース１の横一側方のケース壁１１に一対のオネジ杆３７ａ・３７ｂを貫通させるので、その螺動操作をポンプケース１の横一側方で容易に行うことができる。
【００３１】
【発明の実施の形態】
本発明の実施の形態を図面に基づいて説明する。図１〜図３は本発明の実施形態を説明する図である。この実施形態は、燃料噴射装置をエンジンに装着する方法と燃料噴射装置に関するものである。
【００３２】
図３に燃料噴射装置を装着したディーゼルエンジンを示す。このエンジンの構成は次の通りである。
クランクケース２０の後部にフライホイルカバー４５を装着し、その内部にフライホイル３６を収容している。クランクケース２０の前部に調時伝動ギヤケース８を取り付け、この調時伝動ギヤケース８の前部にエンジン冷却ファン２１を取り付けている。この調時伝動ギヤケース８の一端部はクランクケース２０の横壁よりも横側に大きく導出させている。この導出端部２２の後部に燃料噴射装置２３を取り付けている。燃料噴射装置２３の後部にはガバナ部２４を装着している。
【００３３】
図１と図２に燃料噴射装置を示す。この燃料噴射装置２３の構成は次の通りである。
燃料噴射装置２３は、ポンプケース１と、ポンプケース１に固定した燃料噴射ポンプ２と、ポンプケース１内に架設した燃料噴射カム軸３と、ポンプケース１のケース端壁４に設けた接続部５と、この接続部５から突出させた燃料噴射カム軸３の入力端部６と、ポンプケース１のケース壁１１に螺動自在に貫通させ一対のオネジ杆３７ａ・３７ｂとを備えている。この一対のオネジ杆３７ａ・３７ｂは燃料噴射カム軸３の仮止め手段１０として機能する。
【００３４】
一対のオネジ杆３７ａ・３７ｂの先端を燃料噴射カム軸３に接当させ、燃料噴射カム軸３の正回転３ａを一方のオネジ杆３７ａで、逆回転３ｂを他方のオネジ杆３７ｂでそれぞれ受け止めることにより、燃料噴射カム軸３を所定の姿勢でポンプケース１に仮止めできるようにしている。
【００３５】
エンジンの調時伝動ギヤケース８にポンプケース１をその接続部５で接続できるようにし、燃料噴射カム軸３の入力端部６に燃料噴射カムギヤ７を所定の姿勢で固定できるようにし、調時伝動ギヤケース８に接続したポンプケース１を、燃料噴射カム軸３を中心として回転できるようにし、回転を停止させた姿勢のポンプケース１を調時伝動ギヤケース８に固定できるようにしている。
【００３６】
上記構成の詳細は次の通りである。
図２に示すように、燃料噴射ポンプ２には列型のものを用いている。ポンプケース１に燃料噴射ポンプ２を固定するため、ポンプケース１内にその上部から燃料噴射ポンプ２を差し込み、そのフランジ部２５をポンプ取り付けボルト２６でポンプケース１に固定している。ポンプケース１内に燃料噴射カム軸３を架設するため、図１（Ａ）に示すように、ポンプケース１のケース端壁４にベアリング３０を設け、このベアリング３０に燃料噴射カム軸３を軸受けさせている。燃料噴射カム軸３のカム面４９には燃料噴射ポンプ３のタペット５０を接当させている。ポンプケース１の接続部５を、ポンプケース１のケース端壁４にビス２９で固定している。
【００３７】
図１（Ｂ）に示すように、一対のオネジ杆３７ａ・３７ｂを、ポンプケース１の横一側のケース壁１１に平行な姿勢で貫通させている。燃料噴射カム軸３に長方形の係止ブロック３８を形成し、この係止ブロック３８の平坦面３８ｃの両端部に位置する一対の個所３８ａ・３８ｂに一対のオネジ杆３７ａ・３７ｂの先端を接当させている。
【００３８】
図１（Ａ）に示すように、調時伝動ギヤケース８にポンプケース１を接続できるようにするため、調時伝動ギヤケース８の背板３１にあけた嵌合孔３２に接続部５を内嵌できるようにしている。また、燃料噴射カム軸３の入力端部６に燃料噴射カムギヤ７を所定の姿勢で固定できるようにするため、入力端部６にキー溝２７を設け、キー２８により燃料噴射カムギヤ７を固定できるようにしている。
【００３９】
また、調時伝動ギヤケース８に接続したポンプケース１を燃料噴射カム軸３を中心として回転できるようにするため、図２に示すように、接続部５を円環状に形成し、その中心部から燃料噴射カム軸３の入力端部６を突出させ、図１（Ａ）に示すように、調時伝動ギヤケース８の円型の嵌合孔３２に、接続部５が回転自在に内嵌されるようにしてある。また、回転を停止させた姿勢のポンプケース１を調時伝動ギヤケース８に固定できるようにするため、図２（Ｂ）に示すように、ポンプケース１のケース端壁４に燃料噴射カム軸３を中心とする円弧状の長孔３４を設け、図１（Ａ）に示すように、この長孔３４に挿通させた取り付けボルト３３でポンプケース１を調時伝動ギヤケース８に固定できるようにしている。
【００４０】
上記燃料噴射装置２３をエンジンに装着する方法は次の通りである。
まず、図１（Ｂ）に示すように、燃料噴射カム軸３の回転を仮止めする作業と、クランク軸１７の回転を仮止めする作業とを行う。
【００４１】
燃料噴射カム軸３の回転を仮止めする作業では、一対のオネジ杆３７ａ・３７ｂの先端を燃料噴射カム軸３に接当させ、燃料噴射カム軸３の正回転３ａを一方のオネジ杆３７ａで、逆回転３ｂを他方のオネジ杆３７ｂでそれぞれ受け止めることにより、燃料噴射カム軸３を所定の姿勢でポンプケース１に仮止めする。
クランク軸１７の回転を仮止めする作業では、クランク軸１７を所定の姿勢でエンジンに仮止めする。
【００４２】
次に、エンジンの調時伝動ギヤケース８にポンプケース１をその接続部５で接続する作業と、燃料噴射カム軸３の入力端部６に燃料噴射カムギヤ７を所定の姿勢で固定する作業と、クランクギヤ１５の連動ギヤ１６に燃料噴射カムギヤ７を所定の姿勢で噛み合わせる作業とを行う。
【００４３】
次に、調時伝動ギヤケース８に接続したポンプケース１を、燃料噴射カム軸３を中心として、その逆回転３ｂと同じ方向１９に回転させ、クランクギヤ１５から燃料噴射カムギヤ７までの調時伝動ギヤ列４３の遊びがなくなることにより、ポンプケース１の回転が停止した後、停止した姿勢のポンプケース１を調時伝動ギヤケース８に固定する。
次に、燃料噴射カム軸３の回転の仮止めと、クランク軸１７の回転の仮止めとを解除する。
【００４４】
上記方法の詳細は次の通りである。
前記した燃料噴射カム軸３の回転を仮止めする作業を行うに際し、燃料噴射カム軸３の姿勢を予備調節する作業を行った後、燃料噴射カム軸３の姿勢を微調節する作業を行う。
【００４５】
燃料噴射カム軸３の姿勢を予備調節する作業では、一対のオネジ杆３７ａ・３７ｂの先端を燃料噴射カム軸３から離した状態で、燃料噴射カム軸３を回転させることにより、燃料噴射カム軸３の姿勢を所定の姿勢に近づける。
【００４６】
燃料噴射カム軸３の姿勢を微調節する作業では、一対のオネジ杆３７ａ・３７ｂの先端を燃料噴射カム軸３に接当させる作業と、燃料噴射カム軸３の姿勢を検出する作業とを行う。
【００４７】
検出した燃料噴射カム軸３の姿勢が所定の姿勢よりも正回転３ａ方向にずれている場合には、逆回転３ｂを受け止めるオネジ杆３７ｂを燃料噴射カム軸３から離れる方向に螺動させた後、他方のオネジ杆３７ａを燃料噴射カム軸３に向けて螺動させることにより、逆回転３ｂを受け止めるオネジ杆３７ｂに燃料噴射カム軸３が受け止められるまで、燃料噴射カム軸３の姿勢を逆回転３ｂ方向にずらす。
【００４８】
検出した燃料噴射カム軸３の姿勢が所定の姿勢よりも逆回転３ｂ方向にずれている場合には、正回転３ａを受け止めるオネジ杆３７ａを燃料噴射カム軸３から離れる方向に螺動させた後、他方のオネジ杆３７ｂに向けて螺動させることにより、正回転３ａを受け止めるオネジ杆３７ａに燃料噴射カム軸３が受け止められるまで、燃料噴射カム軸３の姿勢を正回転３ａ方向にずらす。この実施形態における燃料噴射カム軸３の所定の姿勢とは、図２（Ｂ）に示す姿勢をいう。すなわち、燃料噴射ポンプ２のプランジャの軸線４７から、燃料噴射カム軸３の正回転３ａ方向に僅かな角度４８だけキー溝２７をずらした姿勢をいう。
【００４９】
燃料噴射カム軸３の姿勢を予備調節する作業を行うに際しては、図２（Ａ）に示すように、燃料噴射カム軸３をステップモータ４１で回転させる。燃料噴射カム軸３の姿勢の検出は、ステップモータ４１に内設しているロータリエンコーダにより行う。
【００５０】
図１（Ｂ）に示すように、前記クランク軸１７を仮止めするには、フライホイルカバー４５に押さえボルト３９を螺動自在に挿通し、この押さえボルト３９の先端をフライホイル３６に接当させることにより行う。また、クランク軸１７の姿勢は、ピストンの位置をダイヤルゲージ等で測定することにより測定できる。また、フライホイルカバー４５の指針４６と符合したフライホイル３６の目盛り４４により、クランク角度を読み取ることによっても特定できる。また、前記調時伝動ギヤ列４３の各ギヤ同士の噛み合わせは、各ギヤに設けたマーク１４同士を符合させて行う。
【００５１】
前記燃料噴射カム軸３の仮止めの解除は、一対のオネジ杆３７ａ・３７ｂをポンプケース１から抜き取ることにより行う。一対のオネジ杆３７ａ・３７ｂを抜き取った後のネジ孔は栓で塞いでおく。また、前記クランク軸１７の仮止めの解除は、押さえボルト３９をフライホイルカバー４５から抜き取ることにより行う。押さえボルト３９を抜き取った後のネジ孔は栓で塞いでおく。
【図面の簡単な説明】
【図１】本発明の実施形態に係る燃料噴射装置とこれをエンジンに装着する方法を説明する図で、図１（Ａ）は調時伝動ギヤケースに装着した燃料噴射装置の要部縦断面図、図１（Ｂ）は図１（Ａ）のＢ−Ｂ線断面図である。
【図２】本発明の実施形態に係る燃料噴射装置を説明する図で、図２（Ａ）は燃料噴射装置の側面図、図２（Ｂ）は燃料噴射装置の正面図である。
【図３】本発明の実施形態に係る燃料噴射装置を装着したエンジンの平面図である。
【図４】従来技術に係る燃料噴射装置とこれをエンジンに装着する方法を説明する図で、図４（Ａ）は調時伝動ギヤケースに装着した燃料噴射装置の要部縦断面図、図４（Ｂ）は図４（Ａ）のＢ−Ｂ線断面図である。
【符号の説明】
１…ポンプケース、２…燃料噴射ポンプ、３…燃料噴射カム軸、３ａ・３ｂ…正逆回転、４…ケース端壁、５…接続部、６…入力端部、７…燃料噴射カムギヤ、８…調時伝動ギヤケース、１１…ケース壁、１５…クランクギヤ、１６…連動ギヤ、１７…クランク軸、１９…逆回転３ｂと同じ方向、２３…燃料噴射装置、３７ａ・３７ｂ…一対のオネジ杆、４１…ステップモータ、４３…調時伝動ギヤ列。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of mounting a fuel injection device on an engine and a fuel injection device.
[0002]
[Prior art]
Prior to the present invention, the inventors of the present invention manufactured a fuel injection device for engine mounting shown in FIG. The fuel injection device 123 is configured as follows.
The fuel injection device 123 includes a pump case 101, a fuel injection pump 102 fixed to the pump case 101, a fuel injection cam shaft 103 installed in the pump case 101, and a connection provided on the case end wall 104 of the pump case 101. And an input end portion 106 of the fuel injection camshaft 103 protruding from the connection portion 105.
[0003]
Then, the pump case 101 can be connected to the engine timing transmission gear case 108 by the connecting portion 105, and the fuel injection cam gear 107 can be fixed to the input end portion 106 of the fuel injection cam shaft 103 in a predetermined posture. The pump case 101 connected to the hour transmission gear case 108 can be rotated about the fuel injection cam shaft 103, and the pump case 101 in a posture in which the rotation is stopped can be fixed to the timing transmission gear case 108.
[0004]
The inventors of the present invention mounted the device 123 on the engine as follows.
The operation of connecting the pump case 101 to the engine timing transmission gear case 108 at its connecting portion 105, the operation of fixing the fuel injection cam gear 107 to the input end portion 106 of the fuel injection cam shaft 103 in a predetermined posture, and the crank gear 115 The interlocking gear 116 is engaged with the fuel injection cam gear 107 in a predetermined posture. The gears of the timing transmission gear train 143 from the crank gear 115 to the fuel injection cam gear 107 are engaged with each other by matching the marks 114 provided on each gear.
[0005]
The device 123 does not have a means for temporarily stopping the rotation of the fuel injection camshaft 103 as in the device of the present invention. When the device 123 is mounted on the engine, a pump is connected to the timing gear case 108 of the engine. After connecting the case 101, it is necessary to perform an operation for setting the fuel injection start timing.
[0006]
The work for setting the fuel injection start time was performed as follows.
First, the pump case 101 was temporarily fixed to the timing transmission gear case 108 in an arbitrary posture. Next, the fuel oil level of the fuel outlet (not shown) of the fuel injection pump 102 was visually observed while manually rotating the crankshaft 117 slowly. When the fuel oil level started to rise, this was regarded as the start of fuel injection, and the rotation of the crankshaft 117 was stopped at that time. Next, the crank angle was read by the scale 144 of the flywheel 136 coinciding with the pointer 146 of the flywheel cover 145, and the injection start timing was measured. Next, in order to bring the measured injection start time closer to the target value, the temporary fixing of the pump case 101 was released, and the pump case 101 was rotated. By this rotation, the posture of the fuel injection pump 102 with respect to the fuel injection camshaft 103 was corrected, and the pump case 101 was temporarily fixed again. Thereafter, the measurement of the injection start timing and the correction of the posture of the fuel injection pump 102 were repeated until the injection start timing reached the target value.
[0007]
[Problems to be solved by the invention]
The above technique has the following problems.
In the above technology, the fuel oil level at the fuel discharge port of the fuel injection pump 102 is visually observed and the fuel injection start timing is measured based on this observation. However, such an observation method lacks accuracy and the measurement accuracy of the injection start time is lowered. Further, the play of the timing transmission gear train 143 also causes a decrease in the measurement accuracy of the injection start timing. Thus, in the above technique, since the measurement accuracy of the injection start time is low, the injection start time cannot be set accurately.
[0008]
In the above technique, after the pump case 101 is connected to the timing transmission gear case 108 of the engine, an operation for setting the injection start time is performed. In this work, since the measurement of the injection start time and the correction of the posture of the fuel injection pump 102 are repeated, the work time becomes relatively long. Then, after the posture of the fuel injection pump 102 is determined by this operation, an operation of connecting a fuel injection pipe (not shown) to the fuel injection pump 102 is performed. As described above, in the above technique, the setting work of the injection start time unrelated to the engine assembly work is interrupted between the connection work of the pump case 101 and the fuel injection pipe connection work which are part of the engine assembly work. Since the engine assembly work is interrupted for a relatively long time, the engine assembly work is stagnant.
[0009]
Problems to be solved by each invention are as follows.
The first to third inventions all relate to a method of mounting a fuel injection device on an engine. It is an object of the first invention to provide a fuel injection start timing that can be accurately set and the assembly work of the engine does not stagnate. In addition to the problems of the first invention, the second invention provides an apparatus that can set the fuel injection timing more accurately and that can effectively use a pair of male screw rods as temporary fixing means for the fuel injection camshaft. To do. In addition to the subject of the second invention, the third invention is intended to provide a device that can quickly and accurately perform the work of preliminarily adjusting the attitude of the fuel injection camshaft.
[0010]
The fourth invention and the fifth invention both relate to an engine for engine mounting. 4th invention makes it a subject to provide what can be used effectively for the method of 1st invention from 3rd invention. In addition to the subject of 4th invention, the 5th invention makes it a subject to provide what can perform the screwing operation of a pair of male screw rods easily.
[0011]
[Means for Solving the Problems]
The main configurations of the first to fifth inventions are as follows.
(First invention)
The first invention relates to a method of mounting a fuel injection device on an engine.
The first invention includes a pump case 1, a fuel injection pump 2, a fuel injection camshaft 3, a connection portion 5, an input end portion 6 of the fuel injection camshaft 3, and a pair of male screws 37a and 37b. The following operation is performed using the fuel injection device 23 for mounting the engine.
[0012]
An operation of temporarily stopping the rotation of the fuel injection camshaft 3 and an operation of temporarily stopping the rotation of the crankshaft 17 are performed. In the operation of temporarily stopping the rotation of the fuel injection cam shaft 3, the forward and reverse rotations 3a and 3b of the fuel injection cam shaft 3 are received by the pair of male screw rods 37a and 37b.
[0013]
Next, an operation of connecting the pump case 1 to the engine timing transmission gear case 8 and an operation of meshing the timing transmission gear train 43 are performed. Next, the pump case 1 is rotated to eliminate play of the timing transmission gear train 43, and then the pump case 1 is fixed to the timing transmission gear case 8.
Next, the temporary stop of the rotation of the fuel injection cam shaft 3 and the temporary stop of the rotation of the crankshaft 17 are released.
Thereby, when the play of the timing transmission gear train 43 is eliminated, the reaction force in the same direction as the forward rotation 3a applied to the fuel injection camshaft 3 is received by the male screw rod 37a receiving the forward rotation 3a, and the fuel injection camshaft The injection start time is set without shifting the temporary fixing posture of No. 3 .
[0014]
The temporarily fixed posture of the fuel injection camshaft 3 and the crankshaft 17 is determined as follows. When the engine model to which the fuel injection device 23 is assembled and the target value of the injection start timing are determined, the relative postures of the crankshaft 17, the fuel injection camshaft 3, and the fuel injection pump 2 are determined by actual measurement or calculation. For this reason, when the fuel injection device 23 is mounted on the engine, the temporarily fixed posture of the fuel injection camshaft 3 and the crankshaft 17 is determined so that the above relative posture is reproduced. The forward rotation 3a of the fuel injection camshaft 3 refers to the rotation in the direction in which the fuel injection camshaft 3 is interlocked from the crankshaft 17 during engine operation, and the reverse rotation 3b is the reverse direction to the forward rotation 3a. Rotation.
[0015]
(Second invention)
The second invention relates to a method of mounting a fuel injection device on an engine.
According to a second aspect of the invention, in the first aspect of the invention, when the operation of temporarily stopping the rotation of the fuel injection camshaft 3 is performed, the operation of preliminarily adjusting the posture of the fuel injection camshaft 3 is performed, and then the posture of the fuel camshaft 3 is changed. A fine adjustment operation is performed, and a pair of male screw rods 37a and 37b is used for the fine adjustment operation.
[0016]
(Third invention)
The third invention relates to a method of mounting a fuel injection device on an engine.
The third invention is characterized in that, in the second invention, the fuel injection camshaft 3 is rotated by a step motor 41 when the operation for preliminarily adjusting the posture of the fuel injection camshaft 3 is performed.
[0017]
The fourth invention relates to a fuel injection device for mounting an engine.
The fourth invention includes a pump case 1, a fuel injection pump 2 fixed to the pump case 1, a fuel injection cam shaft 3 installed in the pump case 1, and a connection portion 5 provided on a case end wall 4 of the pump case 1. An engine mounting comprising an input end 6 of the fuel injection camshaft 3 projecting from the connecting portion 5 and a pair of male screw rods 37a and 37b threadably penetrating through the case wall 11 of the pump case 1 A fuel injection device for
The tips of the pair of male screw rods 37a and 37b are brought into contact with the fuel injection cam shaft 3, and the forward rotation 3a of the fuel injection cam shaft 3 is received by one male screw rod 37a and the reverse rotation 3b is received by the other male screw rod 37b. Thus, the fuel injection camshaft 3 can be temporarily fixed to the pump case 1 in a predetermined posture,
The pump case 1 can be connected to the engine timing transmission gear case 8 at its connecting portion 5, and the fuel injection cam gear 7 can be fixed to the input end 6 of the fuel injection cam shaft 3 in a predetermined posture. By allowing the pump case 1 connected to the gear case 8 to rotate about the fuel injection camshaft 3 and fixing the pump case 1 in a posture in which the rotation is stopped to the timing transmission gear case 8,
When a reaction force in the same direction as the forward rotation 3a is applied to the fuel injection camshaft 3, the reaction force is received by the male screw rod 37a that receives the forward rotation 3a, and the temporary stop posture of the fuel injection camshaft 3 is not shifted. I did it.
[0018]
The fifth invention relates to a fuel injection device for mounting an engine.
The fifth invention is characterized in that, in the fourth invention, a pair of male threaded rods 37a and 37b are passed through the case wall 11 on one side of the pump case 1.
[0019]
[Action]
The operation of the first invention is as follows.
In the first invention, since the fuel injection camshaft 3 is temporarily fixed to the pump case 1 before the pump case 1 is connected to the timing transmission gear case 8, the fuel injection is performed with the pump case 1 fixed to a jig or the like. The temporary fixing operation of the camshaft 3 can be performed, and the temporary fixing posture can be accurately set.
[0020]
Further, since the forward and reverse rotations 3a and 3b of the fuel injection cam shaft 3 are received by the pair of male screw rods 37a and 37b, respectively, the temporarily fixed posture of the fuel injection cam shaft 3 can be reliably maintained. Further, since the posture of the crankshaft 17 can be accurately specified by measuring the position of the piston or the like, the temporarily fixed posture of the crankshaft 17 can also be set accurately.
[0021]
Further, the play of the timing transmission gear train 43 can be eliminated simply by rotating the pump case 1 in the same direction 19 as the reverse rotation 3 b of the fuel injection camshaft 3. At this time, a reaction force in the same direction as the forward rotation 3a is applied to the fuel injection cam shaft 3, but this reaction force is received by the male screw 37a that receives the forward rotation 3a. Will not slip.
[0022]
In the first invention, after temporarily fixing the fuel injection camshaft 3 and the crankshaft 17 in a predetermined posture, the pump case 1 is connected to the timing transmission gear case 8, and the timing transmission gear train 43 is engaged, The injection start time is set only by rotating the pump case 1. Among these, the operation of temporarily fixing the fuel injection camshaft 3 is performed before the pump case 1 is connected to the timing transmission gear case 8, and therefore can be performed separately from the assembly operation of the engine. Further, the remaining work can be performed in a relatively short time during the assembly work of the engine.
[0023]
【The invention's effect】
(First invention)
The first invention has the following effects.
In the first invention, the temporarily fixed posture of the fuel injection camshaft 3 can be accurately set, and the posture can be reliably maintained. Also, the temporarily fixed posture of the crankshaft 17 can be set accurately. Further, the play of the timing transmission gear train 43 can be eliminated, and at this time, the temporarily fixed posture of the fuel injection camshaft 3 is not shifted. For these reasons, in the first invention, the fuel injection timing can be set accurately.
[0024]
In the first invention, among the operations for setting the injection start timing, the operation for temporarily fixing the fuel injection camshaft 3 can be performed separately from the engine assembly operation, and the remaining operations are performed during the engine assembly operation. Can be performed in a relatively short time. For this reason, the assembly work of the engine does not stagnate.
[0025]
(Second invention)
The second invention has the following effects in addition to the effects of the first invention.
In the second invention, since the attitude of the fuel injection camshaft 3 is preliminarily adjusted and then the attitude is finely adjusted, the temporarily fixed attitude of the fuel injection camshaft 3 can be set accurately. For this reason, the fuel injection timing can be set more accurately.
[0026]
In the second invention, the posture of the fuel injection camshaft 3 is finely adjusted by the screwing operation of the pair of male screw rods 37a and 37b. Therefore, the pair of male thread rods 37a and 37b, which are temporary fixing means for the fuel injection camshaft 3, can be effectively used as fine adjustment means for the attitude of the fuel injection camshaft 3.
[0027]
(Third invention)
In addition to the effects of the second invention, the third invention has the following effects.
In the third aspect of the invention, the fuel injection camshaft 3 is rotated by the step motor 41 when performing an operation for preliminarily adjusting the posture of the fuel injection camshaft 3. For this reason, it is possible to perform the preliminary adjustment work quickly and accurately.
[0028]
In the third aspect of the invention, the posture of the fuel injection camshaft 3 is preliminarily adjusted by the step motor 41, and then the posture is finely adjusted by the pair of male screw rods 37a and 37b. For this reason, it is not necessary to use a step motor 41 having high positioning accuracy.
[0029]
(Fourth invention)
The fourth invention has the following effects.
The apparatus of the fourth invention can be effectively used in the methods of the first to third inventions.
[0030]
(Fifth invention)
The fifth invention has the following effects in addition to the effects of the fourth invention.
In the fourth aspect of the invention, since the pair of male threaded rods 37a and 37b are passed through the case wall 11 on the lateral side of the pump case 1, the screwing operation can be easily performed on the lateral side of the pump case 1. .
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. 1 to 3 are diagrams illustrating an embodiment of the present invention. This embodiment relates to a method of mounting a fuel injection device on an engine and a fuel injection device.
[0032]
FIG. 3 shows a diesel engine equipped with a fuel injection device. The configuration of this engine is as follows.
A flywheel cover 45 is attached to the rear part of the crankcase 20 and a flywheel 36 is accommodated therein. A timing transmission gear case 8 is attached to the front portion of the crankcase 20, and an engine cooling fan 21 is attached to the front portion of the timing transmission gear case 8. One end of the timing transmission gear case 8 is led out to the side of the lateral wall of the crankcase 20. A fuel injection device 23 is attached to the rear portion of the lead-out end 22. A governor portion 24 is attached to the rear portion of the fuel injection device 23.
[0033]
1 and 2 show the fuel injection device. The configuration of the fuel injection device 23 is as follows.
The fuel injection device 23 includes a pump case 1, a fuel injection pump 2 fixed to the pump case 1, a fuel injection cam shaft 3 installed in the pump case 1, and a connecting portion provided on the case end wall 4 of the pump case 1. 5, an input end portion 6 of the fuel injection camshaft 3 projecting from the connection portion 5, and a pair of male screws 37 a and 37 b that are threadably penetrated through the case wall 11 of the pump case 1. The pair of male screw rods 37 a and 37 b function as temporary fixing means 10 for the fuel injection cam shaft 3.
[0034]
The tips of the pair of male screw rods 37a and 37b are brought into contact with the fuel injection cam shaft 3, and the forward rotation 3a of the fuel injection cam shaft 3 is received by one male screw rod 37a and the reverse rotation 3b is received by the other male screw rod 37b. Thus, the fuel injection camshaft 3 can be temporarily fixed to the pump case 1 in a predetermined posture.
[0035]
The pump case 1 can be connected to the engine timing transmission gear case 8 at its connecting portion 5, and the fuel injection cam gear 7 can be fixed to the input end 6 of the fuel injection cam shaft 3 in a predetermined posture. The pump case 1 connected to the gear case 8 can be rotated about the fuel injection cam shaft 3, and the pump case 1 in a posture in which the rotation is stopped can be fixed to the timing transmission gear case 8.
[0036]
Details of the above configuration are as follows.
As shown in FIG. 2, the fuel injection pump 2 is a row type. In order to fix the fuel injection pump 2 to the pump case 1, the fuel injection pump 2 is inserted into the pump case 1 from above, and the flange portion 25 is fixed to the pump case 1 with a pump mounting bolt 26. In order to install the fuel injection cam shaft 3 in the pump case 1, as shown in FIG. 1A, a bearing 30 is provided on the case end wall 4 of the pump case 1, and the fuel injection cam shaft 3 is supported by the bearing 30. I am letting. A tappet 50 of the fuel injection pump 3 is brought into contact with the cam surface 49 of the fuel injection camshaft 3. The connecting portion 5 of the pump case 1 is fixed to the case end wall 4 of the pump case 1 with screws 29.
[0037]
As shown in FIG. 1B, a pair of male thread rods 37 a and 37 b are penetrated in a posture parallel to the case wall 11 on the lateral side of the pump case 1. A rectangular locking block 38 is formed on the fuel injection cam shaft 3, and the ends of a pair of male screw rods 37a and 37b are brought into contact with a pair of locations 38a and 38b located at both ends of the flat surface 38c of the locking block 38. I am letting.
[0038]
As shown in FIG. 1A, in order to connect the pump case 1 to the timing transmission gear case 8, the connection portion 5 is fitted in the fitting hole 32 formed in the back plate 31 of the timing transmission gear case 8. I can do it. Further, in order to be able to fix the fuel injection cam gear 7 to the input end portion 6 of the fuel injection cam shaft 3 in a predetermined posture, a key groove 27 is provided in the input end portion 6 and the fuel injection cam gear 7 can be fixed by the key 28. I am doing so.
[0039]
Further, in order to allow the pump case 1 connected to the timing transmission gear case 8 to rotate about the fuel injection camshaft 3, as shown in FIG. The input end portion 6 of the fuel injection camshaft 3 is protruded, and the connecting portion 5 is rotatably fitted in the circular fitting hole 32 of the timing transmission gear case 8 as shown in FIG. It is like that. Further, in order to be able to fix the pump case 1 in a posture in which the rotation is stopped to the timing transmission gear case 8, as shown in FIG. 2B, the fuel injection camshaft 3 is placed on the case end wall 4 of the pump case 1. An arc-shaped long hole 34 is provided around the center, and the pump case 1 can be fixed to the timing transmission gear case 8 with a mounting bolt 33 inserted through the long hole 34 as shown in FIG. Yes.
[0040]
A method of mounting the fuel injection device 23 on the engine is as follows.
First, as shown in FIG. 1B, an operation of temporarily stopping the rotation of the fuel injection camshaft 3 and an operation of temporarily stopping the rotation of the crankshaft 17 are performed.
[0041]
In the operation of temporarily stopping the rotation of the fuel injection camshaft 3, the ends of the pair of male screw rods 37a and 37b are brought into contact with the fuel injection camshaft 3, and the positive rotation 3a of the fuel injection camshaft 3 is moved by one male screw rod 37a. The reverse rotation 3b is received by the other male threaded rod 37b to temporarily fix the fuel injection camshaft 3 to the pump case 1 in a predetermined posture.
In the operation of temporarily fixing the rotation of the crankshaft 17, the crankshaft 17 is temporarily fixed to the engine in a predetermined posture.
[0042]
Next, an operation of connecting the pump case 1 to the engine timing transmission gear case 8 at its connecting portion 5, an operation of fixing the fuel injection cam gear 7 to the input end portion 6 of the fuel injection cam shaft 3 in a predetermined posture, The operation of engaging the fuel injection cam gear 7 in a predetermined posture with the interlocking gear 16 of the crank gear 15 is performed.
[0043]
Next, the pump case 1 connected to the timing transmission gear case 8 is rotated around the fuel injection cam shaft 3 in the same direction 19 as the reverse rotation 3b, and the timing transmission from the crank gear 15 to the fuel injection cam gear 7 is performed. Since the play of the gear train 43 is eliminated, the pump case 1 in the stopped posture is fixed to the timing transmission gear case 8 after the rotation of the pump case 1 is stopped.
Next, the temporary stop of the rotation of the fuel injection cam shaft 3 and the temporary stop of the rotation of the crankshaft 17 are released.
[0044]
Details of the above method are as follows.
When performing the operation of temporarily stopping the rotation of the fuel injection cam shaft 3 described above, the operation of preliminarily adjusting the posture of the fuel injection cam shaft 3 is performed, and then the operation of finely adjusting the posture of the fuel injection cam shaft 3 is performed.
[0045]
In the pre-adjustment of the posture of the fuel injection camshaft 3, the fuel injection camshaft 3 is rotated by rotating the fuel injection camshaft 3 with the tips of the pair of male screw rods 37a and 37b separated from the fuel injection camshaft 3. 3 posture is brought close to a predetermined posture.
[0046]
In the operation of finely adjusting the posture of the fuel injection cam shaft 3, the operation of bringing the tip ends of the pair of male screw rods 37a and 37b into contact with the fuel injection cam shaft 3 and the operation of detecting the posture of the fuel injection cam shaft 3 are performed. .
[0047]
When the detected posture of the fuel injection camshaft 3 is deviated in the forward rotation 3a direction from the predetermined posture, the male screw rod 37b for receiving the reverse rotation 3b is screwed in a direction away from the fuel injection camshaft 3. By rotating the other male screw rod 37a toward the fuel injection camshaft 3, the posture of the fuel injection camshaft 3 is reversely rotated until the fuel injection camshaft 3 is received by the male screw rod 37b receiving the reverse rotation 3b. Shift in 3b direction.
[0048]
When the detected posture of the fuel injection camshaft 3 is deviated in the reverse rotation 3b direction from the predetermined posture, the male screw rod 37a that receives the forward rotation 3a is screwed in a direction away from the fuel injection camshaft 3. Then, the position of the fuel injection camshaft 3 is shifted in the direction of the positive rotation 3a until the fuel injection camshaft 3 is received by the male screw rod 37a that receives the forward rotation 3a by being screwed toward the other male screw rod 37b. The predetermined posture of the fuel injection camshaft 3 in this embodiment refers to the posture shown in FIG. That is, the key groove 27 is displaced from the axis 47 of the plunger of the fuel injection pump 2 by a slight angle 48 in the direction of the forward rotation 3a of the fuel injection camshaft 3.
[0049]
When performing an operation for preliminarily adjusting the posture of the fuel injection camshaft 3, the fuel injection camshaft 3 is rotated by a step motor 41 as shown in FIG. The posture of the fuel injection camshaft 3 is detected by a rotary encoder provided in the step motor 41.
[0050]
As shown in FIG. 1B, in order to temporarily fix the crankshaft 17, a presser bolt 39 is threadably inserted into the flywheel cover 45 and the tip of the presser bolt 39 is brought into contact with the flywheel 36. To do. The posture of the crankshaft 17 can be measured by measuring the position of the piston with a dial gauge or the like. It can also be specified by reading the crank angle with the scale 44 of the flywheel 36 that matches the pointer 46 of the flywheel cover 45. Further, the gears of the timing transmission gear train 43 are engaged with each other by matching the marks 14 provided on the gears.
[0051]
The temporary stop of the fuel injection camshaft 3 is released by removing the pair of male threaded rods 37a and 37b from the pump case 1. The screw holes after the pair of male screw rods 37a and 37b are removed are closed with stoppers. The temporary fixing of the crankshaft 17 is released by removing the holding bolt 39 from the flywheel cover 45. The screw hole after removing the holding bolt 39 is closed with a stopper.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a fuel injection device according to an embodiment of the present invention and a method for mounting the fuel injection device on an engine, and FIG. 1 (A) is a longitudinal sectional view of an essential part of the fuel injection device mounted on a timing transmission gear case. FIG. 1B is a cross-sectional view taken along line BB in FIG.
2A and 2B are diagrams illustrating a fuel injection device according to an embodiment of the present invention. FIG. 2A is a side view of the fuel injection device, and FIG. 2B is a front view of the fuel injection device.
FIG. 3 is a plan view of an engine equipped with a fuel injection device according to an embodiment of the present invention.
4 is a diagram for explaining a fuel injection device according to the prior art and a method for mounting the fuel injection device on an engine. FIG. 4 (A) is a longitudinal sectional view of a main part of the fuel injection device mounted on a timing transmission gear case. (B) is the BB sectional drawing of FIG. 4 (A).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pump case, 2 ... Fuel injection pump, 3 ... Fuel injection cam shaft, 3a * 3b ... Forward / reverse rotation, 4 ... Case end wall, 5 ... Connection part, 6 ... Input end part, 7 ... Fuel injection cam gear, 8 ... Timing transmission gear case, 11 ... Case wall, 15 ... Crank gear, 16 ... Interlocking gear, 17 ... Crankshaft, 19 ... Same direction as reverse rotation 3b, 23 ... Fuel injection device, 37a, 37b ... A pair of male screw rods, 41 ... Step motor, 43 ... Timed transmission gear train.

Claims

A pump case (1), a fuel injection pump (2) fixed to the pump case (1), a fuel injection camshaft (3) installed in the pump case (1), and a case end wall of the pump case (1) A connecting portion (5) provided in (4), an input end portion (6) of the fuel injection camshaft (3) protruding from the connecting portion (5), and a case wall (11) of the pump case (1). A fuel injection device (23) for mounting an engine comprising a pair of male screw rods (37a) and (37b) threadably passed through
The operation of temporarily stopping the rotation of the fuel injection camshaft (3) and the operation of temporarily stopping the rotation of the crankshaft (17) are performed.
In the operation of temporarily stopping the rotation of the fuel injection camshaft (3), the tip ends of the pair of male screws (37a) and (37b) are brought into contact with the fuel injection camshaft (3), and the fuel injection camshaft (3) By receiving the forward rotation (3a) with one male screw rod (37a) and the reverse rotation (3b) with the other male screw rod (37b), the fuel injection camshaft (3) is placed in a predetermined posture in the pump case (1 ) Temporarily,
In the work of temporarily fixing the rotation of the crankshaft (17), the crankshaft (17) is temporarily fixed to the engine in a predetermined posture,
Next, the operation of connecting the pump case (1) to the engine timing transmission gear case (8) at its connecting portion (5), and the fuel injection cam gear (to the input end portion (6) of the fuel injection cam shaft (3)). 7) to fix the fuel injection cam gear (7) in a predetermined posture to the crank gear (15) or its interlocking gear (16).
Next, the pump case (1) connected to the timing transmission gear case (8) is rotated around the fuel injection camshaft (3) in the same direction (19) as the reverse rotation (3b), and the crank gear ( 15) to the fuel injection cam gear (7), the play of the timing transmission gear train (43) is eliminated, and the pump case (1) in the stopped position is timed after the rotation of the pump case (1) stops. Secure to the transmission gear case (8)
Next, by temporarily releasing the rotation of the fuel injection camshaft (3) and temporarily stopping the rotation of the crankshaft (17) ,
When eliminating the play of the timing transmission gear train (43), a reaction force in the same direction as according forward rotation to the fuel injection cam shaft (3) (3a) is in male screw rod for receiving the forward rotation (3a) (37a) receiving is, without shifting the temporary fixing position of the fuel injection cam shaft (3), a method of mounting, characterized in that the setting of injection starting time period is to be performed, the fuel injection device to an engine.

In the method of mounting the fuel injection device according to claim 1 to the engine, when performing the operation of temporarily stopping the rotation of the fuel injection camshaft (3),
After preliminarily adjusting the attitude of the fuel injection camshaft (3), the work of finely adjusting the attitude of the fuel injection camshaft (3) is performed,
In the pre-adjustment of the posture of the fuel injection camshaft (3), the fuel injection camshaft (3) is kept in a state where the tips of the pair of male screws (37a) and (37b) are separated from the fuel injection camshaft (3). , The posture of the fuel injection camshaft (3) is brought close to a predetermined posture,
In the operation of finely adjusting the posture of the fuel injection cam shaft (3), the operation of bringing the ends of the pair of male screws (37a) and (37b) into contact with the fuel injection cam shaft (3), and the fuel injection cam shaft (3 ) To detect the posture of
When the detected posture of the fuel injection camshaft (3) is deviated in the forward rotation (3a) direction from the predetermined posture, the male screw rod (37b) for receiving the reverse rotation (3b) is attached to the fuel injection camshaft (3 ) And then screw the other male screw rod (37a) toward the fuel injection camshaft (3) to inject fuel into the male screw rod (37b) receiving the reverse rotation (3b). The posture of the fuel injection cam shaft (3) is shifted in the reverse rotation (3b) direction until the cam shaft (3) is received.
When the detected posture of the fuel injection camshaft (3) is deviated in the reverse rotation (3b) direction from the predetermined posture, the male screw rod (37a) that receives the forward rotation (3a) is attached to the fuel injection camshaft (3 ) And then screw the other male screw rod (37b) toward the fuel injection camshaft (3) to inject fuel into the male screw rod (37a) that receives the forward rotation (3a). A method for mounting a fuel injection device on an engine, wherein the posture of the fuel injection cam shaft (3) is shifted in the direction of the forward rotation (3a) until the cam shaft (3) is received.

In the method for mounting the fuel injection device on the engine according to claim 2, when performing the pre-adjustment of the attitude of the fuel injection camshaft (3), the fuel injection camshaft (3) is moved by the step motor (41). A method for mounting a fuel injection device on an engine, comprising rotating the fuel injection device.

A pump case (1), a fuel injection pump (2) fixed to the pump case (1), a fuel injection camshaft (3) installed in the pump case (1), and a case end wall of the pump case (1) A connecting portion (5) provided in (4), an input end portion (6) of the fuel injection camshaft (3) protruding from the connecting portion (5), and a case wall (11) of the pump case (1). A fuel injection device for mounting on an engine, comprising a pair of male screw rods (37a) and (37b) threadably passed through
The tips of the pair of male screw rods (37a) and (37b) are brought into contact with the fuel injection cam shaft (3), and the forward rotation (3a) of the fuel injection cam shaft (3) is reversed by one male screw rod (37a). By receiving the rotation (3b) with the other male screw rod (37b), the fuel injection camshaft (3) can be temporarily fixed to the pump case (1) in a predetermined posture.
The pump case (1) can be connected to the engine timing transmission gear case (8) at its connecting portion (5), and the fuel injection cam gear (7) is connected to the input end (6) of the fuel injection cam shaft (3). The pump case (1), which can be fixed in a predetermined posture and connected to the timing transmission gear case (8), can rotate about the fuel injection camshaft (3), and the pump case has a posture in which the rotation is stopped. By enabling (1) to be fixed to the timing transmission gear case (8) ,
When a reaction force in the same direction as the forward rotation ( 3a ) is applied to the fuel injection cam shaft ( 3 ) , the reaction force is received by the male screw ３７ ( 37a ) that receives the forward rotation ( 3a ) , and the fuel injection cam shaft ( 3 The fuel injection device for mounting on an engine is characterized in that the temporarily fixed posture of ) is not shifted .

5. A fuel injection device for mounting an engine according to claim 4, wherein a pair of male screws (37a) and (37b) are passed through the case wall (11) on one side of the pump case (1). A fuel injection device for mounting the engine.